[linux-block.git] / fs / 9p / vfs_dir.c

/*
 * linux/fs/9p/vfs_dir.c
 *
 * This file contains vfs directory ops for the 9P2000 protocol.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"

/**
 * dt_type - return file type
 * @mistat: mistat structure
 *
 */

static inline int dt_type(struct p9_stat *mistat)
{
	unsigned long perm = mistat->mode;
	int rettype = DT_REG;

	if (perm & P9_DMDIR)
		rettype = DT_DIR;
	if (perm & P9_DMSYMLINK)
		rettype = DT_LNK;

	return rettype;
}

/**
 * v9fs_dir_readdir - read a directory
 * @filp: opened file structure
 * @dirent: directory structure ???
 * @filldir: function to populate directory structure ???
 *
 */

static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	int over;
	struct p9_fid *fid;
	struct v9fs_session_info *v9ses;
	struct inode *inode;
	struct p9_stat *st;

	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
	inode = filp->f_path.dentry->d_inode;
	v9ses = v9fs_inode2v9ses(inode);
	fid = filp->private_data;
	while ((st = p9_client_dirread(fid, filp->f_pos)) != NULL) {
		if (IS_ERR(st))
			return PTR_ERR(st);

		over = filldir(dirent, st->name.str, st->name.len, filp->f_pos,
			v9fs_qid2ino(&st->qid), dt_type(st));

		if (over)
			break;

		filp->f_pos += st->size;
		kfree(st);
		st = NULL;
	}

	kfree(st);
	return 0;
}


/**
 * v9fs_dir_release - close a directory
 * @inode: inode of the directory
 * @filp: file pointer to a directory
 *
 */

int v9fs_dir_release(struct inode *inode, struct file *filp)
{
	struct p9_fid *fid;

	fid = filp->private_data;
	P9_DPRINTK(P9_DEBUG_VFS,
			"inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
	filemap_write_and_wait(inode->i_mapping);
	p9_client_clunk(fid);
	return 0;
}

const struct file_operations v9fs_dir_operations = {
	.read = generic_read_dir,
	.llseek = generic_file_llseek,
	.readdir = v9fs_dir_readdir,
	.open = v9fs_file_open,
	.release = v9fs_dir_release,
};
Commit	Line	Data
e69e7fe5 EVH	1	/*
	2	* linux/fs/9p/vfs_dir.c
	3	*
	4	* This file contains vfs directory ops for the 9P2000 protocol.
	5	*
	6	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	7	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
42e8c509 EVH	10	* it under the terms of the GNU General Public License version 2
42e8c509 EVH	11	* as published by the Free Software Foundation.
e69e7fe5 EVH	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to:
	20	* Free Software Foundation
	21	* 51 Franklin Street, Fifth Floor
	22	* Boston, MA 02111-1301 USA
	23	*
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/errno.h>
	28	#include <linux/fs.h>
	29	#include <linux/file.h>
	30	#include <linux/stat.h>
	31	#include <linux/string.h>
914e2637	32	#include <linux/sched.h>
e69e7fe5 EVH	33	#include <linux/inet.h>
e69e7fe5 EVH	34	#include <linux/idr.h>
bd238fb4 LI	35	#include <net/9p/9p.h>
bd238fb4 LI	36	#include <net/9p/client.h>
e69e7fe5	37
e69e7fe5	38	#include "v9fs.h"
531b1094	39	#include "v9fs_vfs.h"
e69e7fe5 EVH	40	#include "fid.h"
	41
	42	/**
	43	* dt_type - return file type
	44	* @mistat: mistat structure
	45	*
	46	*/
	47
bd238fb4	48	static inline int dt_type(struct p9_stat *mistat)
e69e7fe5 EVH	49	{
	50	unsigned long perm = mistat->mode;
	51	int rettype = DT_REG;
	52
bd238fb4	53	if (perm & P9_DMDIR)
e69e7fe5	54	rettype = DT_DIR;
bd238fb4	55	if (perm & P9_DMSYMLINK)
e69e7fe5 EVH	56	rettype = DT_LNK;
	57
	58	return rettype;
	59	}
	60
	61	/**
	62	* v9fs_dir_readdir - read a directory
ee443996	63	* @filp: opened file structure
e69e7fe5 EVH	64	* @dirent: directory structure ???
	65	* @filldir: function to populate directory structure ???
	66	*
	67	*/
	68
	69	static int v9fs_dir_readdir(struct file filp, void dirent, filldir_t filldir)
	70	{
bd238fb4 LI	71	int over;
	72	struct p9_fid *fid;
	73	struct v9fs_session_info *v9ses;
	74	struct inode *inode;
	75	struct p9_stat *st;
	76
	77	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
	78	inode = filp->f_path.dentry->d_inode;
	79	v9ses = v9fs_inode2v9ses(inode);
	80	fid = filp->private_data;
	81	while ((st = p9_client_dirread(fid, filp->f_pos)) != NULL) {
	82	if (IS_ERR(st))
	83	return PTR_ERR(st);
	84
	85	over = filldir(dirent, st->name.str, st->name.len, filp->f_pos,
	86	v9fs_qid2ino(&st->qid), dt_type(st));
	87
	88	if (over)
e69e7fe5 EVH	89	break;
e69e7fe5 EVH	90
bd238fb4 LI	91	filp->f_pos += st->size;
	92	kfree(st);
	93	st = NULL;
e69e7fe5 EVH	94	}
e69e7fe5 EVH	95
bd238fb4 LI	96	kfree(st);
bd238fb4 LI	97	return 0;
e69e7fe5 EVH	98	}
e69e7fe5 EVH	99
bd238fb4	100
e69e7fe5 EVH	101	/**
	102	* v9fs_dir_release - close a directory
	103	* @inode: inode of the directory
	104	* @filp: file pointer to a directory
	105	*
	106	*/
	107
	108	int v9fs_dir_release(struct inode inode, struct file filp)
	109	{
bd238fb4	110	struct p9_fid *fid;
e69e7fe5	111
bd238fb4 LI	112	fid = filp->private_data;
	113	P9_DPRINTK(P9_DEBUG_VFS,
	114	"inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
28fd1298	115	filemap_write_and_wait(inode->i_mapping);
bd238fb4	116	p9_client_clunk(fid);
e69e7fe5 EVH	117	return 0;
	118	}
	119
4b6f5d20	120	const struct file_operations v9fs_dir_operations = {
e69e7fe5	121	.read = generic_read_dir,
59af1584	122	.llseek = generic_file_llseek,
e69e7fe5 EVH	123	.readdir = v9fs_dir_readdir,
	124	.open = v9fs_file_open,
	125	.release = v9fs_dir_release,
	126	};